Merci!' is a French expression of gratitude that translates to 'Thank you!' It is often used as a polite response to someone who has done something for you, or as a way to express appreciation. The crossword solution for the term 'Merci!' is 'Dieu, ' which is the French word for God. This is a reference to the phrase 'Merci Dieu, ' which is a common expression of thanksgiving and appreciation to God.